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Temperature gauge fluctuates

Reads hot.new radiator,thermostat and sending unit.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 5 Answers

SOURCE: Check gauges light comes on

check the colling fan to see if it kicks on at normal opperating temp 210'
it culd be air in the cooling system
if there is no leakes it could be a leaking haed gaskit

Posted on Oct 22, 2008

  • 2920 Answers

SOURCE: fuel gauge fluctuates on 1995 chevrolet tahoe

if you replaced the tank and all i assume you didnt change the fuel pump. if you dint then all thats wrong is that the float on the fuel pump is gas logged and will move more than if you had put in a new pump thus the fluctuation in the guage.

Posted on Jan 28, 2009

  • 6982 Answers

SOURCE: How do I diagnose a bad thermostat or temperature

You can remove the thermostat and put in a pot of water and boil it.(should open near the stamped temp on yours, 195f) From what you have posted, ti seems that you have a partially obstructed radiator core and at present, it's just bad enough for the electric fan to deal with it. (you can actually see that the temperature fluctuations happen when the fan is on and off) If you do not clean out the radiator, eventually the fan will not be enough to lower the temp and it will begin to actually go into overheat.

Posted on Jun 07, 2009

  • 398 Answers

SOURCE: Temperature gauge fluctuates

First of all you have a bad heater core that needs to be replaced. Second you may have a bad temperature sensor. Make sure the radiator if full of water

Posted on Jan 19, 2010

Wolfman304
  • 720 Answers

SOURCE: 1990 honda accord temp gauge above hot limit.

Hi there,

Firstly - DO NOT run engine, when guage reads hot, as this will cause costly damage to head gasket & alloy engine head.

The fact that guage takes 1min to read HOT, would confirm the guage IS working properly.

So, other components which are likely to cause hot readings (in this order) are:

- lack of coolant (or leakage somewhere): is there sufficient green coolant at the correct level? Top up mixture to correct level. Repair any leaks.

- collapsed radiator hose: when engine is cold, start engine, then quickly watch both upper & lower radiator hoses to see if either begins to flex inwards (collapse). Replace if either hose is collapsed.

- bad/incorrect thermostat rating : when replacing thermostats, you must ensure it is of the SAME temp rating (they all differ).

- Incorrect Temp sensor rating: the ratings of this sensor must be within manufacturer's spec's.

- bad waterpump: the engine relies on the waterpump to distribute the coolant throughout the entire system. If waterpump is faulty, coolant will not flow quick enough, causing overheating.

If you still believe all of the above components are OK, then have your cooling system "pressure tested". This test should be done, before looking further at other electrical components.

Cheers,

"if this has helped you in any way, please rate this solution"

Posted on Jan 27, 2010

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3 Answers

Why does my temperature gauge keep going up and down


An accurate temperature gauge will always fluctuate because the temperature in the engine fluctuates.

Usually the only time this is really noticeable is when the engine has been working hard and suddenly has to wait at a junction or similar and the gauge can rise considerably.

You didn't mention by how much the gauge fluctuates?
As long as it remains approximately in the normal zone it is acceptable but if it climbs into the hot zone or falls into the cold zone it is not acceptable and the cause should be investigated as soon as possible.

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How would I know if my thermostat is broken


If you have a temperature gauge on your dash you can read the engine coolant temperature. After overnight the gauge should be low and during about a 15 minute warm up cycle should achieve about mid range on the dash gauge. It should stabilize at this point with minimal fluctuation through out normal driving.

If you do not have a temperature gauge use an OBDII scan tool where you can read out the engine temperature as you would read the gauge.

A passenger can observe the live readout on the scanner that are equipped with such features while you operate the car.

Hope this helps.?

Apr 11, 2016 | Cars & Trucks

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2000 Gallant. Installed new radiator, thermostat, and water pump. Why does temp gauge read hot when it's not?


Disconnect the temperature sending unit wire connector for the gague ( not the one for the computer ) with the key on. The temp hand should stay on cold mark. Next, ground the wire and the temp hand should go to full hot indicating the gague and wiring to it are ok. If ok suspect a faulty temp sending sensor if the cooling system is full and properly bled

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Why 1998 olds intrigue is running hot.


1) Is it really running hot, or is the temperature sending unit or gauge incorrect? You could use an alternate temperature sensor to test - infrared temperature gauge.
2) Just because the radiator was cleaned out doesn't mean it isnt blocked. Check to see that water will flow through the radiator.

Jun 30, 2014 | 1998 Oldsmobile Intrigue

1 Answer

What causes hyundai Elantra 2002 tempature gauge fluctuates between normal and hot


The thermostat "seals" the cool coolant giving up (rejecting) heat in the radiator & heater core from the hot coolant absorbing heat in the running engine "block".

When the coolant in the engine reaches a specific temperature (180 ~ 195 degrees) as determined by the value selected by manufacturer or when replaced, it opens and allows the hot coolant in the engine block to be pumped out to the radiatot & heater core for cooling and the cool coolant in the radiator / heater core is pumped into the engine block - replacing the hot coolant. The thermostat senses cool coolant in the engine block and seals shut until the temperature of the coolant in the engine block rises to 180 ~ 195 degrees again. This process continues over and over for as long as needed.

You should check to make sure that the coolant level in the reservoir / radiator is sufficient by checking when cold. Do NOT remove a radiator cap when it is hot! With the cap off, start the engine and add additional coolant as the engine warms up to normal operating temperature. If coolant levels are ok, the trouble could be related to the thermostat or possibly a faulty temperature sending switch. This means that the temperature of the coolant is fine - but the switch or sensor that converts the temperature to a voltage for the gauge on yur dashboard is the problem.

If the temperature is fluctuating up and down, you should have it fixed. Good luck!

Apr 12, 2013 | 2002 Hyundai Elantra GT

1 Answer

Engine coolant Temperature gauge fluctuates


Watch the temp gauge when the electric radiator fans come on. The temp sensor that controls when the fan comes on may be faulty.

Oct 11, 2012 | 2000 Pontiac Bonneville

4 Answers

2004 Ford Explorer Sports Trac overheating. I cant find anything that shows any signs of leaking. I've changed the thermostat twice, flushed the radiator and also changed the clutch in the fan to...


Did the engine overheat before the water pump was replaced? If so, you may have a warped cylinder head and/or blown head gasket.

Was the radiator full of rusty-colored liquid before you flushed it? If so, your radiator is probably restricted with rust deposits in the cooling tubes. Flushing WILL NOT get this stuff out. The radiator MUST be replaced if this is the case. Your heater core is probably not in real good shape either, so you should be expecting some heating problems this winter.

If the above is not the correct answer, then you should check to make sure the temperature gauge is not "LYING" to you. This could be caused by a defective gauge, a bad temperature sending unit, or faulty wiring.

The way to check this is with a scan tool that can read engine data and an infrared thermometer. While reading the coolant temperature data from the computer, check the cylinder head temperature with the infrared thermomometer. The readings you get should be within 5 degrees (F) of each other. If the computer data does not match the thermometer within the 5 degrees, then the sending unit for the computer should be replaced.

Then look at the gauge to see if the gauge reading is appropriate to the temperature readings that you took. Normal operating temperature is between 190 and 230 degrees. This should place the gauge at slightly to the right of center to about 5/8ths of the way to HOT. If the readings you took are OK and the gauge is reading higher than this, then you should try replacing the temperature sending unit for the gauge and see if that fixes the problem.

Please note that there are TWO temp sending units: One for the gauge and one for the computer.

Aug 30, 2011 | 2004 Ford Explorer Sport Trac

1 Answer

Temperature gauge don't work..


Sounds like you may have a problem with your coolant temperature sending unit or thermostat, locate your sending unit, unplug the electrical connector run a jumper wire across the 2 wires inside the connector the gauge should read hot when the jumper wires are connected and when you remove the jumper wire it should go back to cold this verifies your gauge and all related wiring are working properly, if it doesnt work as described you either have a wiring problem or a bad temp gauge, next if your heater output is suffering you more then likely have a weak thermostat staying open or partially open replace the thermostat with a new unit, however if you arent experiencing any heater trouble replace your coolant temperature sending unit because your thermostat is more then likely working properly.....

Dec 10, 2010 | Pontiac Grand Am Cars & Trucks

1 Answer

Fluctuating engine temp a/c sends out cold air intermittently


Here's the thing. The ECU will shut down AC if the engine temperature is too hot. If the coolant temperature sensor is malfunctioning (lying to the ECU) telling it that the temperature is hotter than it actually is, the computer will turn the AC OFF.

Sep 11, 2009 | Hyundai Motor 2003 Elantra

1 Answer

How do I diagnose a bad thermostat or temperature sender unit on a 94 Cherokee sport 4.0L? Once the vehicle warms up, the temp gauge on the dash fluctuates from 210 (center of the gauge and normal...


You can remove the thermostat and put in a pot of water and boil it.(should open near the stamped temp on yours, 195f) From what you have posted, ti seems that you have a partially obstructed radiator core and at present, it's just bad enough for the electric fan to deal with it. (you can actually see that the temperature fluctuations happen when the fan is on and off) If you do not clean out the radiator, eventually the fan will not be enough to lower the temp and it will begin to actually go into overheat.

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